Sash-balance



(No Model.)

S. JENKINSON.

l sAsH BALANCE.

Patented Ju1y 15, 1890.

VIO

UNITED STATES PATENT OFFICE.

SAMUEL JENKINSON, or ROCHESTER, NEW YORK.

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 432,137, dated July 15,1890.

.Application filed January 6, 1890. Serial No. 335,960. (No model.)

T0 all whom, it may concern:

Be it known that I, SAMUEL J ENKINsoN, of Rochester, in the county ofMonroe and State of New York, have invented a new and useful Improvementin Sash-Balances, which improvement is fully set forth in the followingspecification, and shown in the accompanying drawings.

My invention relates to that class of sashbalances in which the sash isheld by cords wound upon spring-actuated drums, the cords passing overidle-pulleys above the respective drums.

The ob ject of the invention is to provide an improved method of guidingor carrying the cord, to provide an improved and better brake formodifying the action of the springdrum, and regulate the running of thecord on and off the drum. The invention is hereinafter fully described,and more particularly pointed out in the claims.

Referring to the drawings, Figure l is a side elevation of a part of awindow sash and casing with my improved sash-balance in place,

numerous parts being broken away and vertically sectioned; Fig. 2, aview of the sashbalanee seen, as indicated by arrow in Fig. l, partsbeing broken away and the frame vertieally sectioned, as on the dottedliney in Fig. l, parts being shown in two positions by full and dottedlines; Fig. 3, a view of the device seen, as indicated by arrow e, inFig. l; Fig. 4f, a side elevation of a portion of the frame of thedevice. Fig. 5, drawn to a larger scale, shows one of the bearing-facesof the brake, a part of the rubbing piece being broken away; and Fig.(i, drawn to a still larger scale, is a cross-section taken on thedotted line Qc in Fig. 5.

Referring to the parts, A is the sash, and B the casing of the window,both of common construction.

C is my improved sash-balance set in a cavity a in the casing, in theusual manner, and held to place by ordinary screws b b.

c is the frame of the device, and d the faceplate. D is aSpring-actuated drum, substantially of common construction, held withinthe frame by aXi al projections e e, in the usual manner.

f is the suspending-cord wound upon the drum in circumferential spiralgrooves g.' The cord passes over a grooved idle-pulley h within theframe, held to turn lfreely upon a horizontal shaft e', rigid with theframe, and to move laterally thereon froln side to side of the frame.The cord is attached to the sash by an ordinary fastening device k.

Z is a brake divided at its upper end and held to bear upon the conicalor inclined surfaces n n of the idle-pulley. The brake is held to turnupon a rigid horizontal pin o and is fitted to slide laterally thereon.

p is an adj Listing-screw for the brake, passing freelythrough the lowerend of the brake. This screw passes through a side of the frame in whichit has a bearing,v there being an opening r in the face plate to makeway for the head of the screw.

s is a nut for the screw, with its reduced ends resting in horizontalslots t t in the opposing sides of the frame.

a is a coiled spring upon the adjustingscrew between the nut and thebrake, acting to press the latter against the idle-pulley. By turningthe screw into t-he nut the latter will be drawn toward the brake, thuscompressing the spring and causing it to press the brake more iirmlyagainst the idle-pulley. A reverse motion of the adj listing-screw willcause the brake to bear less heavily upon the idlepulley.

The inner opposing faces of the brake that bear against the idle-pulley,are provided with yielding friction-pieces o, Figs. 5 and 6, to beardirectly upon the surfaces of said pulley. These friction-pieces, whichmay be of leather, india-rubber, and cloth, or similar material, are setinto dovetailed depressions w, as shown, and project beyond therespective faces of the brake.

As the cord Winds upon or unwinds from IOC 1 and 2. These motions of thebrake are radial, it turning` upon the screw p as apivot or center.

I find in practice thatit is advantageous to apply the brake to theidle-pulley rather than to the drum or cord, as is usually done. Theidle-pulley revolves more rapidly than the drum in proportion to thedifference in the two diameters and a much less brake-pressure appliedto the idle-pulley is :needed to regulate the motion of the parts thanif applied to the drum or the cord.

It Will be understood that on account of 'the idle-pulley beingshiftable upon its shaft, as stated, when in different positions, itsplane if extended Would cut the drum at different places.

Vhat I claim as my invention isy 1. In a sash-balance, an actuating-drumand a suspending-cord on the drum, in combination With alaterallymovable idle-p Lilley and a brake pressing` said idle-pulley,substantially as described.

2. The combination, in a sash-balance, of an actuating,` drum and asuspending-cord, with an idle-pulley for the cord, a brake for theidle-pulley, and an adjuster for the brake, substantially as describedand shown.

3. In a sash-balance, a drum and a cord, in combination with anidle-pulley formed with conical or inclined sides and a divided brake tobear upon said inclined sides, substantially as shown.

4. In combination With the drumA and the cord of a sash-balance, alaterally-movable idle-pulley, and a brake bearing upon saididle-pulley, said brake being constructed to turn or swing upon a pivotto keep with the idle-pulley, substantially as shown and set forth.

5. In combination With the drum and the cord of a sash-balance, anidle-pulley and a brake mechanism for said pulley, consisting of a brakeproper, an adj Listing-screw, apressure-spring, anda nut, substantiallyas shown.

In Witness whereof I have hereunto set my hand this 23d day of December,1889. in the presence of two subscribing,` witnesses.

SAMU EL .IENKINSON Witnesses:

E. vB. WHITMORE, M. L. MCDERMOTT.

